The challenge of sustainability confronts us all. It requires cooperation among individuals and nations in making the sacrifices that are in our enlightened self-interest. Beyond that, however, it also requires cooperation among disciplines and among academic, corporate, governmental, and nongovernmental entities in finding solutions that can be maintained. The prospects are daunting at a time when we are seeing increasing political polarisation within and among nations; but there is no acceptable alternative to finding solutions.Accounting for future generations is perhaps an even greater challenge, because they do not have negotiators at the bargaining table. We in the present must care about future generations, decide how to discount and how to evaluate their utility functions, and develop a framework for protecting their interests